Switching Users and Escalating Privilege
There are commands that allow for privilege escalation when needed. Two of the most important ones are su and sudo.
On most Linux systems today, the su command is only used for escalating privileges to root, which is the default user if a username is not specified after the command name. While it can be used to switch to another user, it is not good practice: users should login from another system, over the network, or physical console or terminal on the system.
eduardo ~$ su -
Password:
root ~#
Note
To start the execution environment of the user we are changing into, use the command and option su -